(sina+cosa)^2-sin2a/cos2a+2sin^2a

Question

(sina+cosa)^2-sin2a/cos2a+2sin^2a

Answer 1

(sin²a+cos²a+2sinacosa-2sinacosa)/(cos²a-sin²a+2sin²a)=
=1/(cos²a+sin²a)=1/1=1